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                <time class="level-item has-text-grey" datetime="2018-11-16T00:43:51.000Z">2018-11-16</time>
                
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                PyraNet
            
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            <p>Learning Feature Pyramids for Human Pose Estimation<br><a id="more"></a> </p>
<p>作者在hourglass网络的基础上进行改进，PyraNet网络结构如下所示：<img src="/images/articalImage/PyraNet/PyraNet.png" alt="Pyramid Net"></p>
<p>作者提出四种新的金字塔模块（PRMs）来替换hourglass中的residual模块。<img src="/images/articalImage/PyraNet/PRM.png" alt="PRMs"></p>
<p>PRM-A 是在原先的残差模块的分支基础上，直接增加多个分辨率的分支，其分辨率的不同主要是通过下采样实现的，而由于残差模块的结果需要将不同分支的结果相加，因此下采样后的特征要通过上采样恢复原来分辨率。</p>
<p>PRM-B 则是将 PRM-A 中不同分辨率的分支开始的 1*1 卷积进行参数共享，从而减少参数数量。</p>
<p>PRM-C 则是将 PRM-B 中多分辨率特征的相加改为了串联，由于串联后的特征通道数与原来不同，因此可能需要再进行一个 1*1 的卷积对齐特征通道后再与原特征相加。</p>
<p>PRM-D 则是使用空洞卷积代，替下采样和上采样得到多尺度的特征</p>
<p>Output Variance Accumulation<br><img src="/images/articalImage/PyraNet/ResidualUnit.png" alt="ResidualUnit"></p>
<p>作者还提到原始的残差模块有输出方差积累的问题，当堆叠多个残差块时，将原始特征直接与卷积后的特征相加时会有较大的方差，通过对原始特征添加一个 Bn-ReLu-Conv 操作可以较好的控制这个问题。</p>

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